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<pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a>
<span class="sourceLineNo">002</span> * Copyright (C) 2012 The Guava Authors<a name="line.2"></a>
<span class="sourceLineNo">003</span> *<a name="line.3"></a>
<span class="sourceLineNo">004</span> * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except<a name="line.4"></a>
<span class="sourceLineNo">005</span> * in compliance with the License. You may obtain a copy of the License at<a name="line.5"></a>
<span class="sourceLineNo">006</span> *<a name="line.6"></a>
<span class="sourceLineNo">007</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.7"></a>
<span class="sourceLineNo">008</span> *<a name="line.8"></a>
<span class="sourceLineNo">009</span> * Unless required by applicable law or agreed to in writing, software distributed under the License<a name="line.9"></a>
<span class="sourceLineNo">010</span> * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express<a name="line.10"></a>
<span class="sourceLineNo">011</span> * or implied. See the License for the specific language governing permissions and limitations under<a name="line.11"></a>
<span class="sourceLineNo">012</span> * the License.<a name="line.12"></a>
<span class="sourceLineNo">013</span> */<a name="line.13"></a>
<span class="sourceLineNo">014</span><a name="line.14"></a>
<span class="sourceLineNo">015</span>package com.google.common.io;<a name="line.15"></a>
<span class="sourceLineNo">016</span><a name="line.16"></a>
<span class="sourceLineNo">017</span>import static com.google.common.base.Preconditions.checkArgument;<a name="line.17"></a>
<span class="sourceLineNo">018</span>import static com.google.common.base.Preconditions.checkNotNull;<a name="line.18"></a>
<span class="sourceLineNo">019</span>import static com.google.common.base.Preconditions.checkPositionIndexes;<a name="line.19"></a>
<span class="sourceLineNo">020</span>import static com.google.common.math.IntMath.divide;<a name="line.20"></a>
<span class="sourceLineNo">021</span>import static com.google.common.math.IntMath.log2;<a name="line.21"></a>
<span class="sourceLineNo">022</span>import static java.math.RoundingMode.CEILING;<a name="line.22"></a>
<span class="sourceLineNo">023</span>import static java.math.RoundingMode.UNNECESSARY;<a name="line.23"></a>
<span class="sourceLineNo">024</span><a name="line.24"></a>
<span class="sourceLineNo">025</span>import com.google.common.annotations.Beta;<a name="line.25"></a>
<span class="sourceLineNo">026</span>import com.google.common.annotations.GwtCompatible;<a name="line.26"></a>
<span class="sourceLineNo">027</span>import com.google.common.base.Ascii;<a name="line.27"></a>
<span class="sourceLineNo">028</span>import com.google.common.base.CharMatcher;<a name="line.28"></a>
<span class="sourceLineNo">029</span>import com.google.common.base.Joiner;<a name="line.29"></a>
<span class="sourceLineNo">030</span>import com.google.common.base.Splitter;<a name="line.30"></a>
<span class="sourceLineNo">031</span><a name="line.31"></a>
<span class="sourceLineNo">032</span>import java.util.Arrays;<a name="line.32"></a>
<span class="sourceLineNo">033</span><a name="line.33"></a>
<span class="sourceLineNo">034</span>import javax.annotation.CheckReturnValue;<a name="line.34"></a>
<span class="sourceLineNo">035</span>import javax.annotation.Nullable;<a name="line.35"></a>
<span class="sourceLineNo">036</span><a name="line.36"></a>
<span class="sourceLineNo">037</span>/**<a name="line.37"></a>
<span class="sourceLineNo">038</span> * A binary encoding scheme for translating between byte sequences and ASCII strings. This class<a name="line.38"></a>
<span class="sourceLineNo">039</span> * includes several constants for encoding schemes specified by &lt;a<a name="line.39"></a>
<span class="sourceLineNo">040</span> * href="http://tools.ietf.org/html/rfc4648"&gt;RFC 4648&lt;/a&gt;.<a name="line.40"></a>
<span class="sourceLineNo">041</span> *<a name="line.41"></a>
<span class="sourceLineNo">042</span> * &lt;p&gt;All instances of this class are immutable, so they may be stored safely as static constants.<a name="line.42"></a>
<span class="sourceLineNo">043</span> *<a name="line.43"></a>
<span class="sourceLineNo">044</span> * @author Louis Wasserman<a name="line.44"></a>
<span class="sourceLineNo">045</span> * @since 14.0<a name="line.45"></a>
<span class="sourceLineNo">046</span> */<a name="line.46"></a>
<span class="sourceLineNo">047</span>@Beta<a name="line.47"></a>
<span class="sourceLineNo">048</span>@GwtCompatible<a name="line.48"></a>
<span class="sourceLineNo">049</span>public abstract class BaseEncoding {<a name="line.49"></a>
<span class="sourceLineNo">050</span>  BaseEncoding() {}<a name="line.50"></a>
<span class="sourceLineNo">051</span><a name="line.51"></a>
<span class="sourceLineNo">052</span>  /**<a name="line.52"></a>
<span class="sourceLineNo">053</span>   * Encodes the specified byte array, and returns the encoded {@code String}.<a name="line.53"></a>
<span class="sourceLineNo">054</span>   */<a name="line.54"></a>
<span class="sourceLineNo">055</span>  public String encode(byte[] bytes) {<a name="line.55"></a>
<span class="sourceLineNo">056</span>    return encode(bytes, 0, bytes.length);<a name="line.56"></a>
<span class="sourceLineNo">057</span>  }<a name="line.57"></a>
<span class="sourceLineNo">058</span><a name="line.58"></a>
<span class="sourceLineNo">059</span>  /**<a name="line.59"></a>
<span class="sourceLineNo">060</span>   * Encodes the specified range of the specified byte array, and returns the encoded<a name="line.60"></a>
<span class="sourceLineNo">061</span>   * {@code String}.<a name="line.61"></a>
<span class="sourceLineNo">062</span>   */<a name="line.62"></a>
<span class="sourceLineNo">063</span>  public abstract String encode(byte[] bytes, int off, int len);<a name="line.63"></a>
<span class="sourceLineNo">064</span><a name="line.64"></a>
<span class="sourceLineNo">065</span>  // TODO(user): document the extent of leniency, probably after adding ignore(CharMatcher)<a name="line.65"></a>
<span class="sourceLineNo">066</span><a name="line.66"></a>
<span class="sourceLineNo">067</span>  /**<a name="line.67"></a>
<span class="sourceLineNo">068</span>   * Decodes the specified character sequence, and returns the resulting {@code byte[]}.<a name="line.68"></a>
<span class="sourceLineNo">069</span>   * This is the inverse operation to {@link #encode(byte[])}.<a name="line.69"></a>
<span class="sourceLineNo">070</span>   *<a name="line.70"></a>
<span class="sourceLineNo">071</span>   * @throws IllegalArgumentException if the input is not a valid encoded string according to this<a name="line.71"></a>
<span class="sourceLineNo">072</span>   *         encoding.<a name="line.72"></a>
<span class="sourceLineNo">073</span>   */<a name="line.73"></a>
<span class="sourceLineNo">074</span>  public abstract byte[] decode(CharSequence chars);<a name="line.74"></a>
<span class="sourceLineNo">075</span><a name="line.75"></a>
<span class="sourceLineNo">076</span>  /**<a name="line.76"></a>
<span class="sourceLineNo">077</span>   * Returns an encoding that behaves equivalently to this encoding, but omits any padding<a name="line.77"></a>
<span class="sourceLineNo">078</span>   * characters as specified by &lt;a href="http://tools.ietf.org/html/rfc4648#section-3.2"&gt;RFC 4648<a name="line.78"></a>
<span class="sourceLineNo">079</span>   * section 3.2&lt;/a&gt;, Padding of Encoded Data.<a name="line.79"></a>
<span class="sourceLineNo">080</span>   */<a name="line.80"></a>
<span class="sourceLineNo">081</span>  @CheckReturnValue<a name="line.81"></a>
<span class="sourceLineNo">082</span>  public abstract BaseEncoding omitPadding();<a name="line.82"></a>
<span class="sourceLineNo">083</span><a name="line.83"></a>
<span class="sourceLineNo">084</span>  /**<a name="line.84"></a>
<span class="sourceLineNo">085</span>   * Returns an encoding that behaves equivalently to this encoding, but uses an alternate character<a name="line.85"></a>
<span class="sourceLineNo">086</span>   * for padding.<a name="line.86"></a>
<span class="sourceLineNo">087</span>   *<a name="line.87"></a>
<span class="sourceLineNo">088</span>   * @throws IllegalArgumentException if this padding character is already used in the alphabet or a<a name="line.88"></a>
<span class="sourceLineNo">089</span>   *         separator<a name="line.89"></a>
<span class="sourceLineNo">090</span>   */<a name="line.90"></a>
<span class="sourceLineNo">091</span>  @CheckReturnValue<a name="line.91"></a>
<span class="sourceLineNo">092</span>  public abstract BaseEncoding withPadChar(char padChar);<a name="line.92"></a>
<span class="sourceLineNo">093</span><a name="line.93"></a>
<span class="sourceLineNo">094</span>  /**<a name="line.94"></a>
<span class="sourceLineNo">095</span>   * Returns an encoding that behaves equivalently to this encoding, but adds a separator string<a name="line.95"></a>
<span class="sourceLineNo">096</span>   * after every {@code n} characters. Any occurrences of any characters that occur in the separator<a name="line.96"></a>
<span class="sourceLineNo">097</span>   * are skipped over in decoding.<a name="line.97"></a>
<span class="sourceLineNo">098</span>   *<a name="line.98"></a>
<span class="sourceLineNo">099</span>   * @throws IllegalArgumentException if any alphabet or padding characters appear in the separator<a name="line.99"></a>
<span class="sourceLineNo">100</span>   *         string, or if {@code n &lt;= 0}<a name="line.100"></a>
<span class="sourceLineNo">101</span>   * @throws UnsupportedOperationException if this encoding already uses a separator<a name="line.101"></a>
<span class="sourceLineNo">102</span>   */<a name="line.102"></a>
<span class="sourceLineNo">103</span>  @CheckReturnValue<a name="line.103"></a>
<span class="sourceLineNo">104</span>  public abstract BaseEncoding withSeparator(String separator, int n);<a name="line.104"></a>
<span class="sourceLineNo">105</span><a name="line.105"></a>
<span class="sourceLineNo">106</span>  /**<a name="line.106"></a>
<span class="sourceLineNo">107</span>   * Returns an encoding that behaves equivalently to this encoding, but encodes and decodes with<a name="line.107"></a>
<span class="sourceLineNo">108</span>   * uppercase letters. Padding and separator characters remain in their original case.<a name="line.108"></a>
<span class="sourceLineNo">109</span>   *<a name="line.109"></a>
<span class="sourceLineNo">110</span>   * @throws IllegalStateException if the alphabet used by this encoding contains mixed upper- and<a name="line.110"></a>
<span class="sourceLineNo">111</span>   *         lower-case characters<a name="line.111"></a>
<span class="sourceLineNo">112</span>   */<a name="line.112"></a>
<span class="sourceLineNo">113</span>  @CheckReturnValue<a name="line.113"></a>
<span class="sourceLineNo">114</span>  public abstract BaseEncoding upperCase();<a name="line.114"></a>
<span class="sourceLineNo">115</span><a name="line.115"></a>
<span class="sourceLineNo">116</span>  /**<a name="line.116"></a>
<span class="sourceLineNo">117</span>   * Returns an encoding that behaves equivalently to this encoding, but encodes and decodes with<a name="line.117"></a>
<span class="sourceLineNo">118</span>   * lowercase letters. Padding and separator characters remain in their original case.<a name="line.118"></a>
<span class="sourceLineNo">119</span>   *<a name="line.119"></a>
<span class="sourceLineNo">120</span>   * @throws IllegalStateException if the alphabet used by this encoding contains mixed upper- and<a name="line.120"></a>
<span class="sourceLineNo">121</span>   *         lower-case characters<a name="line.121"></a>
<span class="sourceLineNo">122</span>   */<a name="line.122"></a>
<span class="sourceLineNo">123</span>  @CheckReturnValue<a name="line.123"></a>
<span class="sourceLineNo">124</span>  public abstract BaseEncoding lowerCase();<a name="line.124"></a>
<span class="sourceLineNo">125</span><a name="line.125"></a>
<span class="sourceLineNo">126</span>  private static final BaseEncoding BASE64 = new StandardBaseEncoding(<a name="line.126"></a>
<span class="sourceLineNo">127</span>      "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/", '=');<a name="line.127"></a>
<span class="sourceLineNo">128</span><a name="line.128"></a>
<span class="sourceLineNo">129</span>  /**<a name="line.129"></a>
<span class="sourceLineNo">130</span>   * The "base64" base encoding specified by &lt;a<a name="line.130"></a>
<span class="sourceLineNo">131</span>   * href="http://tools.ietf.org/html/rfc4648#section-4"&gt;RFC 4648 section 4&lt;/a&gt;, Base 64 Encoding.<a name="line.131"></a>
<span class="sourceLineNo">132</span>   * (This is the same as the base 64 encoding from &lt;a<a name="line.132"></a>
<span class="sourceLineNo">133</span>   * href="http://tools.ietf.org/html/rfc3548#section-3"&gt;RFC 3548&lt;/a&gt;.)<a name="line.133"></a>
<span class="sourceLineNo">134</span>   *<a name="line.134"></a>
<span class="sourceLineNo">135</span>   * &lt;p&gt;The character {@code '='} is used for padding, but can be {@linkplain #omitPadding()<a name="line.135"></a>
<span class="sourceLineNo">136</span>   * omitted} or {@linkplain #withPadChar(char) replaced}.<a name="line.136"></a>
<span class="sourceLineNo">137</span>   *<a name="line.137"></a>
<span class="sourceLineNo">138</span>   * &lt;p&gt;No line feeds are added by default, as per &lt;a<a name="line.138"></a>
<span class="sourceLineNo">139</span>   * href="http://tools.ietf.org/html/rfc4648#section-3.1"&gt; RFC 4648 section 3.1&lt;/a&gt;, Line Feeds in<a name="line.139"></a>
<span class="sourceLineNo">140</span>   * Encoded Data. Line feeds may be added using {@link #withSeparator(String, int)}.<a name="line.140"></a>
<span class="sourceLineNo">141</span>   */<a name="line.141"></a>
<span class="sourceLineNo">142</span>  public static BaseEncoding base64() {<a name="line.142"></a>
<span class="sourceLineNo">143</span>    return BASE64;<a name="line.143"></a>
<span class="sourceLineNo">144</span>  }<a name="line.144"></a>
<span class="sourceLineNo">145</span><a name="line.145"></a>
<span class="sourceLineNo">146</span>  private static final BaseEncoding BASE64_URL = new StandardBaseEncoding(<a name="line.146"></a>
<span class="sourceLineNo">147</span>      "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_", '=');<a name="line.147"></a>
<span class="sourceLineNo">148</span><a name="line.148"></a>
<span class="sourceLineNo">149</span>  /**<a name="line.149"></a>
<span class="sourceLineNo">150</span>   * The "base64url" encoding specified by &lt;a<a name="line.150"></a>
<span class="sourceLineNo">151</span>   * href="http://tools.ietf.org/html/rfc4648#section-5"&gt;RFC 4648 section 5&lt;/a&gt;, Base 64 Encoding<a name="line.151"></a>
<span class="sourceLineNo">152</span>   * with URL and Filename Safe Alphabet, also sometimes referred to as the "web safe Base64."<a name="line.152"></a>
<span class="sourceLineNo">153</span>   * (This is the same as the base 64 encoding with URL and filename safe alphabet from &lt;a<a name="line.153"></a>
<span class="sourceLineNo">154</span>   * href="http://tools.ietf.org/html/rfc3548#section-4"&gt;RFC 3548&lt;/a&gt;.)<a name="line.154"></a>
<span class="sourceLineNo">155</span>   *<a name="line.155"></a>
<span class="sourceLineNo">156</span>   * &lt;p&gt;The character {@code '='} is used for padding, but can be {@linkplain #omitPadding()<a name="line.156"></a>
<span class="sourceLineNo">157</span>   * omitted} or {@linkplain #withPadChar(char) replaced}.<a name="line.157"></a>
<span class="sourceLineNo">158</span>   *<a name="line.158"></a>
<span class="sourceLineNo">159</span>   * &lt;p&gt;No line feeds are added by default, as per &lt;a<a name="line.159"></a>
<span class="sourceLineNo">160</span>   * href="http://tools.ietf.org/html/rfc4648#section-3.1"&gt; RFC 4648 section 3.1&lt;/a&gt;, Line Feeds in<a name="line.160"></a>
<span class="sourceLineNo">161</span>   * Encoded Data. Line feeds may be added using {@link #withSeparator(String, int)}.<a name="line.161"></a>
<span class="sourceLineNo">162</span>   */<a name="line.162"></a>
<span class="sourceLineNo">163</span>  public static BaseEncoding base64Url() {<a name="line.163"></a>
<span class="sourceLineNo">164</span>    return BASE64_URL;<a name="line.164"></a>
<span class="sourceLineNo">165</span>  }<a name="line.165"></a>
<span class="sourceLineNo">166</span><a name="line.166"></a>
<span class="sourceLineNo">167</span>  private static final BaseEncoding BASE32 =<a name="line.167"></a>
<span class="sourceLineNo">168</span>      new StandardBaseEncoding("ABCDEFGHIJKLMNOPQRSTUVWXYZ234567", '=');<a name="line.168"></a>
<span class="sourceLineNo">169</span><a name="line.169"></a>
<span class="sourceLineNo">170</span>  /**<a name="line.170"></a>
<span class="sourceLineNo">171</span>   * The "base32" encoding specified by &lt;a<a name="line.171"></a>
<span class="sourceLineNo">172</span>   * href="http://tools.ietf.org/html/rfc4648#section-6"&gt;RFC 4648 section 6&lt;/a&gt;, Base 32 Encoding.<a name="line.172"></a>
<span class="sourceLineNo">173</span>   * (This is the same as the base 32 encoding from &lt;a<a name="line.173"></a>
<span class="sourceLineNo">174</span>   * href="http://tools.ietf.org/html/rfc3548#section-5"&gt;RFC 3548&lt;/a&gt;.)<a name="line.174"></a>
<span class="sourceLineNo">175</span>   *<a name="line.175"></a>
<span class="sourceLineNo">176</span>   * &lt;p&gt;The character {@code '='} is used for padding, but can be {@linkplain #omitPadding()<a name="line.176"></a>
<span class="sourceLineNo">177</span>   * omitted} or {@linkplain #withPadChar(char) replaced}.<a name="line.177"></a>
<span class="sourceLineNo">178</span>   *<a name="line.178"></a>
<span class="sourceLineNo">179</span>   * &lt;p&gt;No line feeds are added by default, as per &lt;a<a name="line.179"></a>
<span class="sourceLineNo">180</span>   * href="http://tools.ietf.org/html/rfc4648#section-3.1"&gt; RFC 4648 section 3.1&lt;/a&gt;, Line Feeds in<a name="line.180"></a>
<span class="sourceLineNo">181</span>   * Encoded Data. Line feeds may be added using {@link #withSeparator(String, int)}.<a name="line.181"></a>
<span class="sourceLineNo">182</span>   */<a name="line.182"></a>
<span class="sourceLineNo">183</span>  public static BaseEncoding base32() {<a name="line.183"></a>
<span class="sourceLineNo">184</span>    return BASE32;<a name="line.184"></a>
<span class="sourceLineNo">185</span>  }<a name="line.185"></a>
<span class="sourceLineNo">186</span><a name="line.186"></a>
<span class="sourceLineNo">187</span>  private static final BaseEncoding BASE32_HEX =<a name="line.187"></a>
<span class="sourceLineNo">188</span>      new StandardBaseEncoding("0123456789ABCDEFGHIJKLMNOPQRSTUV", '=');<a name="line.188"></a>
<span class="sourceLineNo">189</span><a name="line.189"></a>
<span class="sourceLineNo">190</span>  /**<a name="line.190"></a>
<span class="sourceLineNo">191</span>   * The "base32hex" encoding specified by &lt;a<a name="line.191"></a>
<span class="sourceLineNo">192</span>   * href="http://tools.ietf.org/html/rfc4648#section-7"&gt;RFC 4648 section 7&lt;/a&gt;, Base 32 Encoding<a name="line.192"></a>
<span class="sourceLineNo">193</span>   * with Extended Hex Alphabet.  There is no corresponding encoding in RFC 3548.<a name="line.193"></a>
<span class="sourceLineNo">194</span>   *<a name="line.194"></a>
<span class="sourceLineNo">195</span>   * &lt;p&gt;The character {@code '='} is used for padding, but can be {@linkplain #omitPadding()<a name="line.195"></a>
<span class="sourceLineNo">196</span>   * omitted} or {@linkplain #withPadChar(char) replaced}.<a name="line.196"></a>
<span class="sourceLineNo">197</span>   *<a name="line.197"></a>
<span class="sourceLineNo">198</span>   * &lt;p&gt;No line feeds are added by default, as per &lt;a<a name="line.198"></a>
<span class="sourceLineNo">199</span>   * href="http://tools.ietf.org/html/rfc4648#section-3.1"&gt; RFC 4648 section 3.1&lt;/a&gt;, Line Feeds in<a name="line.199"></a>
<span class="sourceLineNo">200</span>   * Encoded Data. Line feeds may be added using {@link #withSeparator(String, int)}.<a name="line.200"></a>
<span class="sourceLineNo">201</span>   */<a name="line.201"></a>
<span class="sourceLineNo">202</span>  public static BaseEncoding base32Hex() {<a name="line.202"></a>
<span class="sourceLineNo">203</span>    return BASE32_HEX;<a name="line.203"></a>
<span class="sourceLineNo">204</span>  }<a name="line.204"></a>
<span class="sourceLineNo">205</span><a name="line.205"></a>
<span class="sourceLineNo">206</span>  private static final BaseEncoding BASE16 = new StandardBaseEncoding("0123456789ABCDEF", null);<a name="line.206"></a>
<span class="sourceLineNo">207</span><a name="line.207"></a>
<span class="sourceLineNo">208</span>  /**<a name="line.208"></a>
<span class="sourceLineNo">209</span>   * The "base16" encoding specified by &lt;a<a name="line.209"></a>
<span class="sourceLineNo">210</span>   * href="http://tools.ietf.org/html/rfc4648#section-8"&gt;RFC 4648 section 8&lt;/a&gt;, Base 16 Encoding.<a name="line.210"></a>
<span class="sourceLineNo">211</span>   * (This is the same as the base 16 encoding from &lt;a<a name="line.211"></a>
<span class="sourceLineNo">212</span>   * href="http://tools.ietf.org/html/rfc3548#section-6"&gt;RFC 3548&lt;/a&gt;.)<a name="line.212"></a>
<span class="sourceLineNo">213</span>   *<a name="line.213"></a>
<span class="sourceLineNo">214</span>   * &lt;p&gt;No padding is necessary in base 16, so {@link #withPadChar(char)} and<a name="line.214"></a>
<span class="sourceLineNo">215</span>   * {@link #omitPadding()} have no effect.<a name="line.215"></a>
<span class="sourceLineNo">216</span>   *<a name="line.216"></a>
<span class="sourceLineNo">217</span>   * &lt;p&gt;No line feeds are added by default, as per &lt;a<a name="line.217"></a>
<span class="sourceLineNo">218</span>   * href="http://tools.ietf.org/html/rfc4648#section-3.1"&gt; RFC 4648 section 3.1&lt;/a&gt;, Line Feeds in<a name="line.218"></a>
<span class="sourceLineNo">219</span>   * Encoded Data. Line feeds may be added using {@link #withSeparator(String, int)}.<a name="line.219"></a>
<span class="sourceLineNo">220</span>   */<a name="line.220"></a>
<span class="sourceLineNo">221</span>  public static BaseEncoding base16() {<a name="line.221"></a>
<span class="sourceLineNo">222</span>    return BASE16;<a name="line.222"></a>
<span class="sourceLineNo">223</span>  }<a name="line.223"></a>
<span class="sourceLineNo">224</span><a name="line.224"></a>
<span class="sourceLineNo">225</span>  static final class StandardBaseEncoding extends BaseEncoding {<a name="line.225"></a>
<span class="sourceLineNo">226</span>    private final String alphabet;<a name="line.226"></a>
<span class="sourceLineNo">227</span>    private final int alphabetMask;<a name="line.227"></a>
<span class="sourceLineNo">228</span>    private final int bitsPerChar;<a name="line.228"></a>
<span class="sourceLineNo">229</span>    private final int charsPerChunk;<a name="line.229"></a>
<span class="sourceLineNo">230</span>    private final int bytesPerChunk;<a name="line.230"></a>
<span class="sourceLineNo">231</span><a name="line.231"></a>
<span class="sourceLineNo">232</span>    @Nullable<a name="line.232"></a>
<span class="sourceLineNo">233</span>    private final Character paddingChar;<a name="line.233"></a>
<span class="sourceLineNo">234</span><a name="line.234"></a>
<span class="sourceLineNo">235</span>    private final byte[] decodabet;<a name="line.235"></a>
<span class="sourceLineNo">236</span><a name="line.236"></a>
<span class="sourceLineNo">237</span>    // The lengths mod charsPerChunk that a non-padded encoded string might possibly have.<a name="line.237"></a>
<span class="sourceLineNo">238</span>    private final boolean[] validPadding;<a name="line.238"></a>
<span class="sourceLineNo">239</span><a name="line.239"></a>
<span class="sourceLineNo">240</span>    StandardBaseEncoding(String alphabet, @Nullable Character paddingChar) {<a name="line.240"></a>
<span class="sourceLineNo">241</span>      this.alphabet = checkNotNull(alphabet);<a name="line.241"></a>
<span class="sourceLineNo">242</span>      try {<a name="line.242"></a>
<span class="sourceLineNo">243</span>        this.bitsPerChar = log2(alphabet.length(), UNNECESSARY);<a name="line.243"></a>
<span class="sourceLineNo">244</span>      } catch (ArithmeticException e) {<a name="line.244"></a>
<span class="sourceLineNo">245</span>        throw new IllegalArgumentException("Illegal alphabet length " + alphabet.length(), e);<a name="line.245"></a>
<span class="sourceLineNo">246</span>      }<a name="line.246"></a>
<span class="sourceLineNo">247</span><a name="line.247"></a>
<span class="sourceLineNo">248</span>      /*<a name="line.248"></a>
<span class="sourceLineNo">249</span>       * e.g. for base64, bitsPerChar == 6, charsPerChunk == 4, and bytesPerChunk == 3. This makes<a name="line.249"></a>
<span class="sourceLineNo">250</span>       * for the smallest chunk size that still has charsPerChunk * bitsPerChar be a multiple of 8.<a name="line.250"></a>
<span class="sourceLineNo">251</span>       */<a name="line.251"></a>
<span class="sourceLineNo">252</span>      int gcd = Math.min(8, Integer.lowestOneBit(bitsPerChar));<a name="line.252"></a>
<span class="sourceLineNo">253</span>      this.charsPerChunk = 8 / gcd;<a name="line.253"></a>
<span class="sourceLineNo">254</span>      this.bytesPerChunk = bitsPerChar / gcd;<a name="line.254"></a>
<span class="sourceLineNo">255</span><a name="line.255"></a>
<span class="sourceLineNo">256</span>      this.alphabetMask = alphabet.length() - 1;<a name="line.256"></a>
<span class="sourceLineNo">257</span><a name="line.257"></a>
<span class="sourceLineNo">258</span>      this.paddingChar = paddingChar;<a name="line.258"></a>
<span class="sourceLineNo">259</span>      checkArgument(paddingChar == null || alphabet.indexOf(paddingChar.charValue()) == -1,<a name="line.259"></a>
<span class="sourceLineNo">260</span>          "Padding character must not appear in alphabet");<a name="line.260"></a>
<span class="sourceLineNo">261</span><a name="line.261"></a>
<span class="sourceLineNo">262</span>      byte[] decodabet = new byte[128];<a name="line.262"></a>
<span class="sourceLineNo">263</span>      Arrays.fill(decodabet, (byte) -1);<a name="line.263"></a>
<span class="sourceLineNo">264</span>      for (int i = 0; i &lt; alphabet.length(); i++) {<a name="line.264"></a>
<span class="sourceLineNo">265</span>        char c = alphabet.charAt(i);<a name="line.265"></a>
<span class="sourceLineNo">266</span>        decodabet[c] = (byte) i;<a name="line.266"></a>
<span class="sourceLineNo">267</span>      }<a name="line.267"></a>
<span class="sourceLineNo">268</span>      this.decodabet = decodabet;<a name="line.268"></a>
<span class="sourceLineNo">269</span><a name="line.269"></a>
<span class="sourceLineNo">270</span>      boolean[] validPadding = new boolean[charsPerChunk];<a name="line.270"></a>
<span class="sourceLineNo">271</span>      for (int i = 0; i &lt; bytesPerChunk; i++) {<a name="line.271"></a>
<span class="sourceLineNo">272</span>        int chars = divide(i * 8, bitsPerChar, CEILING);<a name="line.272"></a>
<span class="sourceLineNo">273</span>        validPadding[chars] = true;<a name="line.273"></a>
<span class="sourceLineNo">274</span>      }<a name="line.274"></a>
<span class="sourceLineNo">275</span>      this.validPadding = validPadding;<a name="line.275"></a>
<span class="sourceLineNo">276</span>    }<a name="line.276"></a>
<span class="sourceLineNo">277</span><a name="line.277"></a>
<span class="sourceLineNo">278</span>    private CharMatcher paddingMatcher() {<a name="line.278"></a>
<span class="sourceLineNo">279</span>      return (paddingChar == null) ? CharMatcher.NONE : CharMatcher.is(paddingChar.charValue());<a name="line.279"></a>
<span class="sourceLineNo">280</span>    }<a name="line.280"></a>
<span class="sourceLineNo">281</span><a name="line.281"></a>
<span class="sourceLineNo">282</span>    @Override<a name="line.282"></a>
<span class="sourceLineNo">283</span>    public String encode(byte[] bytes, int off, int len) {<a name="line.283"></a>
<span class="sourceLineNo">284</span>      checkNotNull(bytes);<a name="line.284"></a>
<span class="sourceLineNo">285</span>      checkPositionIndexes(off, off + len, bytes.length);<a name="line.285"></a>
<span class="sourceLineNo">286</span><a name="line.286"></a>
<span class="sourceLineNo">287</span>      int outputLength = charsPerChunk * divide(len, bytesPerChunk, CEILING);<a name="line.287"></a>
<span class="sourceLineNo">288</span>      StringBuilder builder = new StringBuilder(outputLength);<a name="line.288"></a>
<span class="sourceLineNo">289</span><a name="line.289"></a>
<span class="sourceLineNo">290</span>      int bitBuffer = 0;<a name="line.290"></a>
<span class="sourceLineNo">291</span>      int bitBufferLength = 0;<a name="line.291"></a>
<span class="sourceLineNo">292</span>      for (int i = off; i &lt; off + len; i++) {<a name="line.292"></a>
<span class="sourceLineNo">293</span>        bitBuffer &lt;&lt;= 8;<a name="line.293"></a>
<span class="sourceLineNo">294</span>        bitBuffer |= bytes[i] &amp; 0xFF;<a name="line.294"></a>
<span class="sourceLineNo">295</span>        bitBufferLength += 8;<a name="line.295"></a>
<span class="sourceLineNo">296</span>        while (bitBufferLength &gt;= bitsPerChar) {<a name="line.296"></a>
<span class="sourceLineNo">297</span>          int charIndex = (bitBuffer &gt;&gt;&gt; (bitBufferLength - bitsPerChar)) &amp; alphabetMask;<a name="line.297"></a>
<span class="sourceLineNo">298</span>          builder.append(alphabet.charAt(charIndex));<a name="line.298"></a>
<span class="sourceLineNo">299</span>          bitBufferLength -= bitsPerChar;<a name="line.299"></a>
<span class="sourceLineNo">300</span>        }<a name="line.300"></a>
<span class="sourceLineNo">301</span>      }<a name="line.301"></a>
<span class="sourceLineNo">302</span><a name="line.302"></a>
<span class="sourceLineNo">303</span>      if (bitBufferLength &gt; 0) {<a name="line.303"></a>
<span class="sourceLineNo">304</span>        int charIndex = (bitBuffer &lt;&lt; (bitsPerChar - bitBufferLength)) &amp; alphabetMask;<a name="line.304"></a>
<span class="sourceLineNo">305</span>        builder.append(alphabet.charAt(charIndex));<a name="line.305"></a>
<span class="sourceLineNo">306</span>        if (paddingChar != null) {<a name="line.306"></a>
<span class="sourceLineNo">307</span>          while (builder.length() % charsPerChunk != 0) {<a name="line.307"></a>
<span class="sourceLineNo">308</span>            builder.append(paddingChar.charValue());<a name="line.308"></a>
<span class="sourceLineNo">309</span>          }<a name="line.309"></a>
<span class="sourceLineNo">310</span>        }<a name="line.310"></a>
<span class="sourceLineNo">311</span>      }<a name="line.311"></a>
<span class="sourceLineNo">312</span><a name="line.312"></a>
<span class="sourceLineNo">313</span>      return builder.toString();<a name="line.313"></a>
<span class="sourceLineNo">314</span>    }<a name="line.314"></a>
<span class="sourceLineNo">315</span><a name="line.315"></a>
<span class="sourceLineNo">316</span>    @Override<a name="line.316"></a>
<span class="sourceLineNo">317</span>    public byte[] decode(CharSequence chars) {<a name="line.317"></a>
<span class="sourceLineNo">318</span>      checkNotNull(chars);<a name="line.318"></a>
<span class="sourceLineNo">319</span><a name="line.319"></a>
<span class="sourceLineNo">320</span>      int expectedOutputLength = bytesPerChunk * divide(chars.length(), charsPerChunk, CEILING);<a name="line.320"></a>
<span class="sourceLineNo">321</span>      byte[] output = new byte[expectedOutputLength];<a name="line.321"></a>
<span class="sourceLineNo">322</span>      int outputPosition = 0;<a name="line.322"></a>
<span class="sourceLineNo">323</span><a name="line.323"></a>
<span class="sourceLineNo">324</span>      int bitBuffer = 0;<a name="line.324"></a>
<span class="sourceLineNo">325</span>      int bitBufferLength = 0;<a name="line.325"></a>
<span class="sourceLineNo">326</span><a name="line.326"></a>
<span class="sourceLineNo">327</span>      CharMatcher paddingMatcher = paddingMatcher();<a name="line.327"></a>
<span class="sourceLineNo">328</span><a name="line.328"></a>
<span class="sourceLineNo">329</span>      boolean hitPadding = false;<a name="line.329"></a>
<span class="sourceLineNo">330</span>      for (int i = 0; i &lt; chars.length(); i++) {<a name="line.330"></a>
<span class="sourceLineNo">331</span>        char c = chars.charAt(i);<a name="line.331"></a>
<span class="sourceLineNo">332</span>        if (paddingMatcher.matches(c)) {<a name="line.332"></a>
<span class="sourceLineNo">333</span>          if (!hitPadding &amp;&amp; (i &lt;= 0 || !validPadding[i % charsPerChunk])) {<a name="line.333"></a>
<span class="sourceLineNo">334</span>            throw new IllegalArgumentException("Padding cannot start at index " + i);<a name="line.334"></a>
<span class="sourceLineNo">335</span>          }<a name="line.335"></a>
<span class="sourceLineNo">336</span>          hitPadding = true;<a name="line.336"></a>
<span class="sourceLineNo">337</span>        } else if (hitPadding) {<a name="line.337"></a>
<span class="sourceLineNo">338</span>          throw new IllegalArgumentException(<a name="line.338"></a>
<span class="sourceLineNo">339</span>              "Expected padding character but found '" + c + "' at index " + i);<a name="line.339"></a>
<span class="sourceLineNo">340</span>        } else if (!CharMatcher.ASCII.matches(c) || decodabet[c] == -1) {<a name="line.340"></a>
<span class="sourceLineNo">341</span>          throw new IllegalArgumentException("Unrecognized character: " + c);<a name="line.341"></a>
<span class="sourceLineNo">342</span>        } else {<a name="line.342"></a>
<span class="sourceLineNo">343</span>          bitBuffer &lt;&lt;= bitsPerChar;<a name="line.343"></a>
<span class="sourceLineNo">344</span>          bitBuffer |= decodabet[c] &amp; alphabetMask;<a name="line.344"></a>
<span class="sourceLineNo">345</span>          bitBufferLength += bitsPerChar;<a name="line.345"></a>
<span class="sourceLineNo">346</span><a name="line.346"></a>
<span class="sourceLineNo">347</span>          if (bitBufferLength &gt;= 8) {<a name="line.347"></a>
<span class="sourceLineNo">348</span>            output[outputPosition++] = (byte) (bitBuffer &gt;&gt; (bitBufferLength - 8));<a name="line.348"></a>
<span class="sourceLineNo">349</span>            bitBufferLength -= 8;<a name="line.349"></a>
<span class="sourceLineNo">350</span>          }<a name="line.350"></a>
<span class="sourceLineNo">351</span>        }<a name="line.351"></a>
<span class="sourceLineNo">352</span>      }<a name="line.352"></a>
<span class="sourceLineNo">353</span><a name="line.353"></a>
<span class="sourceLineNo">354</span>      int charsOverChunk = chars.length() % charsPerChunk;<a name="line.354"></a>
<span class="sourceLineNo">355</span>      if (!hitPadding &amp;&amp; !validPadding[charsOverChunk]) {<a name="line.355"></a>
<span class="sourceLineNo">356</span>        throw new IllegalArgumentException("Bad trailing characters \""<a name="line.356"></a>
<span class="sourceLineNo">357</span>            + chars.subSequence(chars.length() - charsOverChunk, chars.length()) + "\"");<a name="line.357"></a>
<span class="sourceLineNo">358</span>      }<a name="line.358"></a>
<span class="sourceLineNo">359</span><a name="line.359"></a>
<span class="sourceLineNo">360</span>      return extract(output, outputPosition);<a name="line.360"></a>
<span class="sourceLineNo">361</span>    }<a name="line.361"></a>
<span class="sourceLineNo">362</span><a name="line.362"></a>
<span class="sourceLineNo">363</span>    private static byte[] extract(byte[] result, int length) {<a name="line.363"></a>
<span class="sourceLineNo">364</span>      if (length == result.length) {<a name="line.364"></a>
<span class="sourceLineNo">365</span>        return result;<a name="line.365"></a>
<span class="sourceLineNo">366</span>      } else {<a name="line.366"></a>
<span class="sourceLineNo">367</span>        byte[] trunc = new byte[length];<a name="line.367"></a>
<span class="sourceLineNo">368</span>        System.arraycopy(result, 0, trunc, 0, length);<a name="line.368"></a>
<span class="sourceLineNo">369</span>        return trunc;<a name="line.369"></a>
<span class="sourceLineNo">370</span>      }<a name="line.370"></a>
<span class="sourceLineNo">371</span>    }<a name="line.371"></a>
<span class="sourceLineNo">372</span><a name="line.372"></a>
<span class="sourceLineNo">373</span>    @Override<a name="line.373"></a>
<span class="sourceLineNo">374</span>    public BaseEncoding omitPadding() {<a name="line.374"></a>
<span class="sourceLineNo">375</span>      return (paddingChar == null) ? this : new StandardBaseEncoding(alphabet, null);<a name="line.375"></a>
<span class="sourceLineNo">376</span>    }<a name="line.376"></a>
<span class="sourceLineNo">377</span><a name="line.377"></a>
<span class="sourceLineNo">378</span>    @Override<a name="line.378"></a>
<span class="sourceLineNo">379</span>    public BaseEncoding withPadChar(char padChar) {<a name="line.379"></a>
<span class="sourceLineNo">380</span>      if (8 % bitsPerChar == 0 || (paddingChar != null &amp;&amp; paddingChar.charValue() == padChar)) {<a name="line.380"></a>
<span class="sourceLineNo">381</span>        return this;<a name="line.381"></a>
<span class="sourceLineNo">382</span>      } else if (alphabet.indexOf(padChar) != -1) {<a name="line.382"></a>
<span class="sourceLineNo">383</span>        throw new IllegalArgumentException("Padding character '" + padChar +<a name="line.383"></a>
<span class="sourceLineNo">384</span>            "'appears in alphabet");<a name="line.384"></a>
<span class="sourceLineNo">385</span>      } else {<a name="line.385"></a>
<span class="sourceLineNo">386</span>        return new StandardBaseEncoding(alphabet, padChar);<a name="line.386"></a>
<span class="sourceLineNo">387</span>      }<a name="line.387"></a>
<span class="sourceLineNo">388</span>    }<a name="line.388"></a>
<span class="sourceLineNo">389</span><a name="line.389"></a>
<span class="sourceLineNo">390</span>    @Override<a name="line.390"></a>
<span class="sourceLineNo">391</span>    public BaseEncoding withSeparator(String separator, int afterEveryChars) {<a name="line.391"></a>
<span class="sourceLineNo">392</span>      checkNotNull(separator);<a name="line.392"></a>
<span class="sourceLineNo">393</span>      checkArgument(paddingMatcher().or(CharMatcher.anyOf(alphabet)).matchesNoneOf(separator),<a name="line.393"></a>
<span class="sourceLineNo">394</span>          "Separator cannot contain alphabet or padding characters");<a name="line.394"></a>
<span class="sourceLineNo">395</span>      return new SeparatedBaseEncoding(this, separator, afterEveryChars);<a name="line.395"></a>
<span class="sourceLineNo">396</span>    }<a name="line.396"></a>
<span class="sourceLineNo">397</span><a name="line.397"></a>
<span class="sourceLineNo">398</span>    private static final CharMatcher ASCII_UPPER_CASE = CharMatcher.inRange('A', 'Z');<a name="line.398"></a>
<span class="sourceLineNo">399</span>    private static final CharMatcher ASCII_NOT_UPPER_CASE =<a name="line.399"></a>
<span class="sourceLineNo">400</span>        CharMatcher.ASCII.and(ASCII_UPPER_CASE.negate());<a name="line.400"></a>
<span class="sourceLineNo">401</span>    private static final CharMatcher ASCII_LOWER_CASE = CharMatcher.inRange('a', 'z');<a name="line.401"></a>
<span class="sourceLineNo">402</span>    private static final CharMatcher ASCII_NOT_LOWER_CASE =<a name="line.402"></a>
<span class="sourceLineNo">403</span>        CharMatcher.ASCII.and(ASCII_LOWER_CASE.negate());<a name="line.403"></a>
<span class="sourceLineNo">404</span><a name="line.404"></a>
<span class="sourceLineNo">405</span>    @Override<a name="line.405"></a>
<span class="sourceLineNo">406</span>    public BaseEncoding upperCase() {<a name="line.406"></a>
<span class="sourceLineNo">407</span>      if (ASCII_UPPER_CASE.matchesAnyOf(alphabet) &amp;&amp; ASCII_LOWER_CASE.matchesAnyOf(alphabet)) {<a name="line.407"></a>
<span class="sourceLineNo">408</span>        throw new IllegalStateException("alphabet uses both upper and lower case characters");<a name="line.408"></a>
<span class="sourceLineNo">409</span>      } else if (ASCII_NOT_LOWER_CASE.matchesAllOf(alphabet)) {<a name="line.409"></a>
<span class="sourceLineNo">410</span>        // already all uppercase or caseless<a name="line.410"></a>
<span class="sourceLineNo">411</span>        return this;<a name="line.411"></a>
<span class="sourceLineNo">412</span>      } else {<a name="line.412"></a>
<span class="sourceLineNo">413</span>        return new StandardBaseEncoding(Ascii.toUpperCase(alphabet), paddingChar);<a name="line.413"></a>
<span class="sourceLineNo">414</span>      }<a name="line.414"></a>
<span class="sourceLineNo">415</span>    }<a name="line.415"></a>
<span class="sourceLineNo">416</span><a name="line.416"></a>
<span class="sourceLineNo">417</span>    @Override<a name="line.417"></a>
<span class="sourceLineNo">418</span>    public BaseEncoding lowerCase() {<a name="line.418"></a>
<span class="sourceLineNo">419</span>      if (ASCII_UPPER_CASE.matchesAnyOf(alphabet) &amp;&amp; ASCII_LOWER_CASE.matchesAnyOf(alphabet)) {<a name="line.419"></a>
<span class="sourceLineNo">420</span>        throw new IllegalStateException("alphabet uses both upper and lower case characters");<a name="line.420"></a>
<span class="sourceLineNo">421</span>      } else if (ASCII_NOT_UPPER_CASE.matchesAllOf(alphabet)) {<a name="line.421"></a>
<span class="sourceLineNo">422</span>        // already all lowercase or caseless<a name="line.422"></a>
<span class="sourceLineNo">423</span>        return this;<a name="line.423"></a>
<span class="sourceLineNo">424</span>      } else {<a name="line.424"></a>
<span class="sourceLineNo">425</span>        return new StandardBaseEncoding(Ascii.toLowerCase(alphabet), paddingChar);<a name="line.425"></a>
<span class="sourceLineNo">426</span>      }<a name="line.426"></a>
<span class="sourceLineNo">427</span>    }<a name="line.427"></a>
<span class="sourceLineNo">428</span>  }<a name="line.428"></a>
<span class="sourceLineNo">429</span><a name="line.429"></a>
<span class="sourceLineNo">430</span>  static final class SeparatedBaseEncoding extends BaseEncoding {<a name="line.430"></a>
<span class="sourceLineNo">431</span>    private final BaseEncoding delegate;<a name="line.431"></a>
<span class="sourceLineNo">432</span>    private final String separator;<a name="line.432"></a>
<span class="sourceLineNo">433</span>    private final int afterEveryChars;<a name="line.433"></a>
<span class="sourceLineNo">434</span>    private final CharMatcher separatorChars;<a name="line.434"></a>
<span class="sourceLineNo">435</span><a name="line.435"></a>
<span class="sourceLineNo">436</span>    SeparatedBaseEncoding(BaseEncoding delegate, String separator, int afterEveryChars) {<a name="line.436"></a>
<span class="sourceLineNo">437</span>      this.delegate = checkNotNull(delegate);<a name="line.437"></a>
<span class="sourceLineNo">438</span>      this.separator = checkNotNull(separator);<a name="line.438"></a>
<span class="sourceLineNo">439</span>      this.afterEveryChars = afterEveryChars;<a name="line.439"></a>
<span class="sourceLineNo">440</span>      checkArgument(<a name="line.440"></a>
<span class="sourceLineNo">441</span>          afterEveryChars &gt; 0, "Cannot add a separator after every %s chars", afterEveryChars);<a name="line.441"></a>
<span class="sourceLineNo">442</span>      this.separatorChars = CharMatcher.anyOf(separator).precomputed();<a name="line.442"></a>
<span class="sourceLineNo">443</span>    }<a name="line.443"></a>
<span class="sourceLineNo">444</span><a name="line.444"></a>
<span class="sourceLineNo">445</span>    @Override<a name="line.445"></a>
<span class="sourceLineNo">446</span>    public String encode(byte[] bytes, int off, int len) {<a name="line.446"></a>
<span class="sourceLineNo">447</span>      // TODO(user): delegate to the streaming implementation when we add it<a name="line.447"></a>
<span class="sourceLineNo">448</span>      String unseparated = delegate.encode(bytes, off, len);<a name="line.448"></a>
<span class="sourceLineNo">449</span>      return Joiner.on(separator).join(Splitter.fixedLength(afterEveryChars).split(unseparated));<a name="line.449"></a>
<span class="sourceLineNo">450</span>    }<a name="line.450"></a>
<span class="sourceLineNo">451</span><a name="line.451"></a>
<span class="sourceLineNo">452</span>    @Override<a name="line.452"></a>
<span class="sourceLineNo">453</span>    public byte[] decode(CharSequence chars) {<a name="line.453"></a>
<span class="sourceLineNo">454</span>      return delegate.decode(separatorChars.removeFrom(chars));<a name="line.454"></a>
<span class="sourceLineNo">455</span>    }<a name="line.455"></a>
<span class="sourceLineNo">456</span><a name="line.456"></a>
<span class="sourceLineNo">457</span>    @Override<a name="line.457"></a>
<span class="sourceLineNo">458</span>    public BaseEncoding omitPadding() {<a name="line.458"></a>
<span class="sourceLineNo">459</span>      return delegate.omitPadding().withSeparator(separator, afterEveryChars);<a name="line.459"></a>
<span class="sourceLineNo">460</span>    }<a name="line.460"></a>
<span class="sourceLineNo">461</span><a name="line.461"></a>
<span class="sourceLineNo">462</span>    @Override<a name="line.462"></a>
<span class="sourceLineNo">463</span>    public BaseEncoding withPadChar(char padChar) {<a name="line.463"></a>
<span class="sourceLineNo">464</span>      return delegate.withPadChar(padChar).withSeparator(separator, afterEveryChars);<a name="line.464"></a>
<span class="sourceLineNo">465</span>    }<a name="line.465"></a>
<span class="sourceLineNo">466</span><a name="line.466"></a>
<span class="sourceLineNo">467</span>    @Override<a name="line.467"></a>
<span class="sourceLineNo">468</span>    public BaseEncoding withSeparator(String separator, int afterEveryChars) {<a name="line.468"></a>
<span class="sourceLineNo">469</span>      throw new UnsupportedOperationException("Already have a separator");<a name="line.469"></a>
<span class="sourceLineNo">470</span>    }<a name="line.470"></a>
<span class="sourceLineNo">471</span><a name="line.471"></a>
<span class="sourceLineNo">472</span>    @Override<a name="line.472"></a>
<span class="sourceLineNo">473</span>    public BaseEncoding upperCase() {<a name="line.473"></a>
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<span class="sourceLineNo">478</span>    public BaseEncoding lowerCase() {<a name="line.478"></a>
<span class="sourceLineNo">479</span>      return delegate.lowerCase().withSeparator(separator, afterEveryChars);<a name="line.479"></a>
<span class="sourceLineNo">480</span>    }<a name="line.480"></a>
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<span class="sourceLineNo">482</span>}<a name="line.482"></a>




























































</pre>
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